Stoichiometry and defect superstructures in epitaxial FeSe films on SrTiO3
نویسندگان
چکیده
منابع مشابه
High temperature superconducting FeSe films on SrTiO3 substrates
Interface enhanced superconductivity at two dimensional limit has become one of most intriguing research directions in condensed matter physics. Here, we report the superconducting properties of ultra-thin FeSe films with the thickness of one unit cell (1-UC) grown on conductive and insulating SrTiO3 (STO) substrates. For the 1-UC FeSe on conductive STO substrate (Nb-STO), the magnetization ver...
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Epitaxial Fe3O4~111! films were grown onto a Pt~111! substrate by repeated cycles of iron deposition and subsequent oxidation in 10 mbar oxygen. A previous low energy electron diffraction ~LEED! intensity analysis revealed the regular Fe3O4~111! surface to expose 1 4 monolayer Fe atoms over a close-packed oxygen layer underneath. With scanning tunneling microscopy ~STM! a hexagonal lattice of p...
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Monoand multilayer FeSe thin films grown on SrTiO3 and BiTiO3 substrates exhibit a greatly enhanced superconductivity over that found in bulk FeSe. A number of proposals have been advanced for the mechanism of this enhancement. One possibility is the introduction of a crossinterface electron–phonon (e–ph) interaction between the FeSe electrons and oxygen phonons in the substrates that is peaked...
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We study the consequences of an electron–phonon (e–ph) interaction that is strongly peaked in the forward scattering ( = q 0) direction in a two-dimensional superconductor usingMigdal–Eliashberg theory.We find that strong forward scattering results in an enhancedTc that is linearly proportional to the strength of the dimensionless e–phcoupling constant lm in theweak coupling limit. This intera...
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ژورنال
عنوان ژورنال: Physical Review Materials
سال: 2020
ISSN: 2475-9953
DOI: 10.1103/physrevmaterials.4.051402